[gnome-control-center/wip/laney/sound-volume-slider-set-mixer] sound: Pass a GvcMixerControl to the stream volume sliders

[Iain Lane <iainl src gnome org>]

commit 209740a3f53ac41a42d1641048a65b9d25e555de
Author: Iain Lane <iainl gnome org>
Date:   Mon Sep 2 15:38:10 2019 +0100

    sound: Pass a GvcMixerControl to the stream volume sliders
    
    Since 9d612ff1c7e2d58211e25e8584bc86c5d2598eac this is required,
    otherwise we never set up the GtkAdjustment and so the scales don't
    display any values or widget to make adjustments, meaning they can't be
    used.
    
    Also call `notify_volume_cb()` from `update_ranges()` to initialise the
    adjustment, since when we set the mixer control we now might not have
    set the value.
    
    Closes #652

 panels/sound/cc-stream-list-box.c |  2 +-
 panels/sound/cc-stream-row.c      | 10 ++++---
 panels/sound/cc-stream-row.h      | 10 ++++---
 panels/sound/cc-volume-slider.c   | 61 ++++++++++++++++++++-------------------
 4 files changed, 45 insertions(+), 38 deletions(-)
---
diff --git a/panels/sound/cc-stream-list-box.c b/panels/sound/cc-stream-list-box.c
index fcc249a25..ca914ef94 100644
--- a/panels/sound/cc-stream-list-box.c
+++ b/panels/sound/cc-stream-list-box.c
@@ -99,7 +99,7 @@ stream_added_cb (CcStreamListBox *self,
       return;
     }
 
-  row = cc_stream_row_new (self->label_size_group, stream, id, self->stream_type);
+  row = cc_stream_row_new (self->label_size_group, stream, id, self->stream_type, self->mixer_control);
   gtk_widget_show (GTK_WIDGET (row));
   gtk_list_box_row_set_activatable (GTK_LIST_BOX_ROW (row), FALSE);
   gtk_container_add (GTK_CONTAINER (self), GTK_WIDGET (row));
diff --git a/panels/sound/cc-stream-row.c b/panels/sound/cc-stream-row.c
index 31d6be79e..4a465fdd5 100644
--- a/panels/sound/cc-stream-row.c
+++ b/panels/sound/cc-stream-row.c
@@ -73,10 +73,11 @@ cc_stream_row_init (CcStreamRow *self)
 }
 
 CcStreamRow *
-cc_stream_row_new (GtkSizeGroup   *size_group,
-                   GvcMixerStream *stream,
-                   guint           id,
-                   CcStreamType    stream_type)
+cc_stream_row_new (GtkSizeGroup    *size_group,
+                   GvcMixerStream  *stream,
+                   guint            id,
+                   CcStreamType     stream_type,
+                   GvcMixerControl *mixer_control)
 {
   CcStreamRow *self;
   g_autoptr(GtkIconInfo) icon_info = NULL;
@@ -110,6 +111,7 @@ cc_stream_row_new (GtkSizeGroup   *size_group,
 
   gtk_label_set_label (self->name_label, gvc_mixer_stream_get_name (stream));
   cc_volume_slider_set_stream (self->volume_slider, stream, stream_type);
+  cc_volume_slider_set_mixer_control (self->volume_slider, mixer_control);
 
   gtk_size_group_add_widget (size_group, GTK_WIDGET (self->label_box));
 
diff --git a/panels/sound/cc-stream-row.h b/panels/sound/cc-stream-row.h
index 3819eef18..9e4de9bde 100644
--- a/panels/sound/cc-stream-row.h
+++ b/panels/sound/cc-stream-row.h
@@ -20,6 +20,7 @@
 
 #include <gtk/gtk.h>
 #include <pulse/pulseaudio.h>
+#include <gvc-mixer-control.h>
 #include <gvc-mixer-stream.h>
 
 #include "cc-sound-enums.h"
@@ -29,10 +30,11 @@ G_BEGIN_DECLS
 #define CC_TYPE_STREAM_ROW (cc_stream_row_get_type ())
 G_DECLARE_FINAL_TYPE (CcStreamRow, cc_stream_row, CC, STREAM_ROW, GtkListBoxRow)
 
-CcStreamRow     *cc_stream_row_new       (GtkSizeGroup   *size_group,
-                                          GvcMixerStream *stream,
-                                          guint           id,
-                                          CcStreamType    stream_type);
+CcStreamRow     *cc_stream_row_new       (GtkSizeGroup    *size_group,
+                                          GvcMixerStream  *stream,
+                                          guint            id,
+                                          CcStreamType     stream_type,
+                                          GvcMixerControl *mixer_control);
 
 GvcMixerStream *cc_stream_row_get_stream (CcStreamRow    *row);
 
diff --git a/panels/sound/cc-volume-slider.c b/panels/sound/cc-volume-slider.c
index 7e061e540..9f0610f63 100644
--- a/panels/sound/cc-volume-slider.c
+++ b/panels/sound/cc-volume-slider.c
@@ -43,6 +43,36 @@ struct _CcVolumeSlider
 
 G_DEFINE_TYPE (CcVolumeSlider, cc_volume_slider, GTK_TYPE_BOX)
 
+static void
+volume_changed_cb (CcVolumeSlider *self)
+{
+  gdouble volume, rounded;
+
+  if (self->stream == NULL)
+    return;
+
+  volume = gtk_adjustment_get_value (self->volume_adjustment);
+  rounded = round (volume);
+
+  gtk_toggle_button_set_active (self->mute_button, volume == 0.0);
+
+  if (gvc_mixer_stream_set_volume (self->stream, (pa_volume_t) rounded))
+      gvc_mixer_stream_push_volume (self->stream);
+}
+
+static void
+notify_volume_cb (CcVolumeSlider *self)
+{
+  g_signal_handlers_block_by_func (self->volume_adjustment, volume_changed_cb, self);
+
+  if (gtk_toggle_button_get_active (self->mute_button))
+    gtk_adjustment_set_value (self->volume_adjustment, 0.0);
+  else
+    gtk_adjustment_set_value (self->volume_adjustment, gvc_mixer_stream_get_volume (self->stream));
+
+  g_signal_handlers_unblock_by_func (self->volume_adjustment, volume_changed_cb, self);
+}
+
 static void
 update_ranges (CcVolumeSlider *self)
 {
@@ -67,25 +97,9 @@ update_ranges (CcVolumeSlider *self)
       gtk_adjustment_set_upper (self->volume_adjustment, vol_max_norm);
     }
   gtk_adjustment_set_page_increment (self->volume_adjustment, vol_max_norm / 100.0);
-}
-
-static void
-volume_changed_cb (CcVolumeSlider *self)
-{
-  gdouble volume, rounded;
 
-  if (self->stream == NULL)
-    return;
-
-  volume = gtk_adjustment_get_value (self->volume_adjustment);
-  rounded = round (volume);
-
-  gtk_toggle_button_set_active (self->mute_button, volume == 0.0);
-  if (gvc_mixer_stream_set_volume (self->stream,
-                                   (pa_volume_t) rounded))
-    {
-      gvc_mixer_stream_push_volume (self->stream);
-    }
+  if (self->stream)
+    notify_volume_cb (self);
 }
 
 static void
@@ -97,17 +111,6 @@ mute_button_toggled_cb (CcVolumeSlider *self)
   gvc_mixer_stream_change_is_muted (self->stream, gtk_toggle_button_get_active (self->mute_button));
 }
 
-static void
-notify_volume_cb (CcVolumeSlider *self)
-{
-  g_signal_handlers_block_by_func (self->volume_adjustment, volume_changed_cb, self);
-  if (gtk_toggle_button_get_active (self->mute_button))
-    gtk_adjustment_set_value (self->volume_adjustment, 0.0);
-  else
-    gtk_adjustment_set_value (self->volume_adjustment, gvc_mixer_stream_get_volume (self->stream));
-  g_signal_handlers_unblock_by_func (self->volume_adjustment, volume_changed_cb, self);
-}
-
 static void
 notify_is_muted_cb (CcVolumeSlider *self)
 {